11. Frank Gore, RB, San Francisco 49ers

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Gore had another solid season in 2011, eclipsing the 1,000-yard mark for the fifth time in seven NFL seasons. But he has taken a lot of hits on his 1,653 career carries, and could soon be on the decline.

Gore had another solid season in 2011, eclipsing the 1,000-yard mark for the fifth time in seven NFL seasons. But he has taken a lot of hits on his 1,653 career carries, and could soon be on the decline. (Getty Images)

Gore had another solid season in 2011, eclipsing the 1,000-yard mark for the fifth time in seven NFL seasons. But he has taken a lot of hits on his 1,653 career carries, and could soon be on the decline.